I have more than that and do it myself, with the aid of Meaningful Money podcast and Meaningful Academy Build Wealth course which comes with a financial planning tool called Voyant Go.
You could use a fixed fee financial planner. Have an initial free chat, see if they can offer value for the money - which could be several thousand.
Do some research yourself... workplace pension, personal pension, S&S ISA, Lifetime ISA (if under age 40), these tax wrappers can all be useful for investing inside them.
Debts - are there any, pay those off to start with.
Emergency fund - have a pot of cash, around 6 months of typical expenses.
S&S ISA - it is accessible so a good one to start with, £100 a month, with the intention of increasing it every couple of months. Gets you in the habit and helps you learn how to invest.
Given your current use of easy access cash ISA's I would not be putting £80k straight in to the stock market. I feel you need to do things gradually, as you may be very risk adverse.
Read some books like:
Reset - David Sawyer
Simple Path To Wealth - JL Collins